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domain |
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domain, in physics: see magnetism magnetism, force of attraction or repulsion between various substances, especially those made of iron and certain other metals; ultimately it is due to the motion of electric charges. ..... Click the link for more information. . domain(1) In a LAN, a subnetwork made up of a group of clients and servers under the control of one security database. Dividing LANs into domains improves performance and security. domain 1. land governed by a ruler or government 2. a region having specific characteristics or containing certain types of plants or animals 3. Austral and NZ a park or recreation reserve maintained by a public authority, often the government 4. Law the absolute ownership and right to dispose of land 5. Maths a. the set of values of the independent variable of a function for which the functional value exists b. any open set containing at least one point 6. Logic another term for universe of discourse (esp in the phrase domain of quantification) 7. Philosophy range of significance (esp in the phrase domain of definition) 8. Physics one of the regions in a ferromagnetic solid in which all the atoms have their magnetic moments aligned in the same direction 9. Computing a group of computers that have the same suffix (domain name) in their names on the internet, specifying the country, type of institution, etc. where they are located 10. Biology the highest level of classification of living organisms. Three domains are recognized: Archaea (see archaean), Bacteria (see bacteria), and Eukarya (see eukaryote) 11. Biochem a structurally compact portion of a protein molecule Domain (electricity and magnetism) A region in a solid within which elementary atomic or molecular magnetic or electric moments are uniformly aligned. Ferromagnetic domains are regions of parallel-aligned magnetic moments. Each domain may be thought of as a tiny magnet pointing in a certain direction. The relatively thin boundary region between two domains is called a domain wall. Within a wall the magnetic moments rotate from the direction of one of the domains to the direction in the adjacent domain. A ferromagnet generally consists of a large number of domains. For example, a sample of pure iron at room temperature contains many domains whose directions are distributed randomly, making the sample appear to be unmagnetized as a whole. Iron is called magnetically soft since the domain walls move easily if a magnetic field is applied. In a magnetically hard or permanent magnet material a net macroscopic magnetization is introduced by exposure to a large external magnetic field, but thereafter domain walls are difficult to either form or move, and the material retains its overall magnetization. Antiferromagnetic domains are regions of antiparallel-aligned magnetic moments. They are associated with the presence of grain boundaries, twinning, and other crystal inhomogeneities. Ferroelectric domains are electrical analogs of ferromagnetic domains. See Antiferromagnetism, Ferroelectrics, Ferromagnetism, Magnetic materials, Magnetization, Twinning (crystallography)
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Then a Stag intruded into his domain and shared his pasture. No sooner had he crossed the border of this domain when two guards seized him and carried him before the Grand Gallipoot of the Growleywogs, who scowled upon him ferociously and asked him why he dared intrude upon his territory. She could not recall a line of them, for Jove had decreed that the memory of them abide in Pluto's painful domain, as a part of the apparatus. |
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